src/Tools/Graphview/graph_file.scala

--- a/src/Tools/Graphview/graph_file.scala	Sun Jan 25 18:31:35 2015 +0100
+++ b/src/Tools/Graphview/graph_file.scala	Sun Jan 25 20:16:27 2015 +0100
@@ -15,7 +15,7 @@
 
 object Graph_File
 {
-  def write(visualizer: Visualizer, file: JFile)
+  def write(file: JFile, visualizer: Visualizer)
   {
     val box = visualizer.bounding_box()
     val w = box.width.ceil.toInt
@@ -34,4 +34,15 @@
     else if (name.endsWith(".pdf")) Graphics_File.write_pdf(file, paint _, w, h)
     else error("Bad type of file: " + quote(name) + " (.png or .pdf expected)")
   }
+
+  def write(options: Options, file: JFile, graph: Graph_Display.Graph)
+  {
+    val model = new Model(graph.transitive_reduction_acyclic)
+
+    val the_options = options
+    val visualizer = new Visualizer(model) { def options = the_options }
+    visualizer.update_layout()
+
+    write(file, visualizer)
+  }
 }